Basic Electricity 3, WASSCE (SC), 2018

Question 2

 

AIM: To verify Kirchhoff’s voltage law.

 


  1. Connect the circuit as shown in Fig. 2.
  2. Ask the supervisor to check the circuit connection.
  3. You are provided with Table 3.

 

 

  1. Adjust V1 to 12 V and V2 to 6 V.
  2. Close switches S1 and S2.
  3. Read and record in Table 3 the ammeter readings I1, I2 and I3.
  4. Open switches S1 and S2.
  5. Compare I1 (mA) with (I2 + I3) (mA).

Observation

 

 

The expected responses were:

TABLE 3

Current (mA)

Value (mA)

I1 (A1)

8.75

I2 (A2)

7.89

I3 (A3)

0.86

  1.  Correct reading of Value (mA)
  2. I1 is equal to the sum of I2 and I3. 

I1 = I2 + I3.
     
      OR
Any other reasonable comparison.     

 

 

  1. Correct circuit connection
    The question required candidates to use the provided apparatus to set up a circuit to verify Kirchhoff’s current law. The observations made for this question is similar to that of question one. Candidates did not perform so well in answering the question.